remove many unnecessary destructors

source/dyaml/constructor.d

@@ -101,17 +101,6 @@ final class Constructor
             addConstructorScalar("tag:yaml.org,2002:merge",     &constructMerge);
         }
 
-        /// Destroy the constructor.
-        @nogc pure @safe nothrow ~this()
-        {
-            fromScalar_.destroy();
-            fromScalar_ = null;
-            fromSequence_.destroy();
-            fromSequence_ = null;
-            fromMapping_.destroy();
-            fromMapping_ = null;
-        }
-
         /** Add a constructor function from scalar.
          *
          * The function must take a reference to $(D Node) to construct from.

source/dyaml/loader.d

@@ -126,13 +126,6 @@ struct Loader
             }
         }
 
-        /// Destroy the Loader.
-        @trusted ~this()
-        {
-            reader_.destroy();
-            scanner_.destroy();
-            parser_.destroy();
-        }
 
         /// Set stream _name. Used in debugging messages.
         void name(string name) pure @safe nothrow @nogc

source/dyaml/parser.d

@@ -142,16 +142,6 @@ final class Parser
             marks_.reserve(32);
         }
 
-        ///Destroy the parser.
-        @trusted ~this()
-        {
-            currentEvent_.destroy();
-            tagDirectives_.destroy();
-            tagDirectives_ = null;
-            states_.destroy();
-            marks_.destroy();
-        }
-
         /**
          * Check if the next event is one of specified types.
          *

source/dyaml/representer.d

@@ -81,13 +81,6 @@ final class Representer
             addRepresenter!SysTime(&representSysTime);
         }
 
-        ///Destroy the Representer.
-        ~this() pure @safe nothrow
-        {
-            representers_.destroy();
-            representers_ = null;
-        }
-
         ///Set default _style for scalars. If style is $(D ScalarStyle.Invalid), the _style is chosen automatically.
         @property void defaultScalarStyle(ScalarStyle style) pure @safe nothrow
         {

source/dyaml/resolver.d

@@ -69,13 +69,6 @@ final class Resolver
             if(defaultImplicitResolvers){addImplicitResolvers();}
         }
 
-        ///Destroy the Resolver.
-        ~this() pure @safe nothrow
-        {
-            yamlImplicitResolvers_.destroy();
-            yamlImplicitResolvers_ = null;
-        }
-
         /**
          * Add an implicit scalar resolver.
          *

source/dyaml/scanner.d

@@ -170,16 +170,6 @@ final class Scanner
             fetchStreamStart();
         }
 
-        /// Destroy the scanner.
-        ~this() @trusted
-        {
-            tokens_.destroy();
-            indents_.destroy();
-            possibleSimpleKeys_.destroy();
-            possibleSimpleKeys_ = null;
-            reader_ = null;
-        }
-
         /// Check if the next token is one of specified types.
         ///
         /// If no types are specified, checks if any tokens are left.

source/dyaml/serializer.d

@@ -85,12 +85,6 @@ struct Serializer
         ~this() @safe
         {
             emitter_.emit(streamEndEvent(Mark(), Mark()));
-            YAMLVersion_.destroy();
-            YAMLVersion_ = null;
-            serializedNodes_.destroy();
-            serializedNodes_ = null;
-            anchors_.destroy();
-            anchors_ = null;
         }
 
         ///Serialize a node, emitting it in the process.